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/*Using Atmega48PA*/
#include <avr/io.h>

int main(void)
{
PORTC = 0×00; //disabling Pull-Up
DDRC = 0xFF;

DDRB = DDRB & 0b11111100;
unsigned char driveBuffer=0;
while(1)
{
if(PINB & 0b11111100)
{
driveBuffer = 0xFE;
}
else if(PINB & 0xFD)
{
driveBuffer = 0xFD;
}
else if(PINB & 0xFE)
{
driveBuffer= 0xFC;
}
else if(PINB == 0b11111111)
{
driveBuffer = 0xFB;
}

PORTC = driveBuffer;
}

}